Being diagnosed with glucose intolerance - a key precursor to full-blown diabetes - may raise your risk of suffering stroke, one study warned. Published in the journal Stroke, the study was conducted by Danish researchers at Rotterdam's Erasmus Medical Center. Researchers assessed the risk of stroke among more than 3,000 patients. Those patients who had been diagnosed with glucose intolerance were a staggering 80% more likely to suffer a stroke than their peers. In addition, excessively low blood glucose levels were associated with a 50% higher risk of stroke. Previous studies have identified glucose intolerance as one of the primary precursors in the development of type 2 diabetes.